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Irina R. Pala, Indika U. Arachchige, Daniel G. Georgiev and Stephanie L. Brock Reversible Gelation of II–VI Nanocrystals: The Nature of Interparticle Bonding and the Origin of Nanocrystal Photochemical Instability Angewandte Chemie International Edition 49

Article first published online: 9 APR 2010 | DOI: 10.1002/anie.201000034

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Programmable assembly and disassembly: Chemical and spectroscopic studies show that Se[BOND]Se bond formation is responsible for the oxidation-induced aggregation of thiolate-capped CdSe nanocrystals to gels. Treatment with reducing agents leads to Se[BOND]Se bond cleavage and dispersion of the gel. This process can be cycled, resulting in successively smaller particles (see picture; MUA = 11-mercaptoundecanoic acid, TMAH = tetramethylammonium hydroxide).

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